Improved self-setting head-block for saw-mills



UNITED STATES PATENT OFFICE.

NEHMIAH KIMBALL, OF PASCOAG, RHODE ISLAND.

IMPROVED SLF-SETTING HEAD-BLOCK FOR SAW-MILLS.

Specification forming part of Letters Patent No. 35,690, dated June 24, 1862.

To all whom, it may concern:

Be it known that I, NEHMIAH KIMBALL, of Pascoag, in the county of Providence and State of Rhode Island, have invented a new, useful, and Improved Self-Setting Head-Block for Saw-Mills; and I do hereby declare that the same is described and represented in the following specitlcation and drawings.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation, referring to the drawings, in which the same letters iudieate like parts in each of the figures.

Figure l is a plan of my self-setting headblock. Fig. 2 is an elevation of one side. Fig. 3 is an elevation of one end.

The nature of my invention consists in the combination and arrangement of devices by which the headbloek traverses the log and sets it automatically.

In the accompanying drawings, A is the head-block of a saw-mill carriage, which may be fastenedV to the sides in the usual manner or otherwise.

B is the rabbet te receive the end ofthe log to be sawed.

C C C C are standards fastened into the block A, and supporting the bars or ways D D, on whichthe carriage E trav erscs, and carries the dog F, which moves the leg. The dog F is made to slide in the carriage E, and it is driven forward to force the spursG Gr into the end of the log, and then the dog is fastened by the set-screw H in the top of the carriage.

The rack I is fastened to the under side of the carriage E, and is acted on by the pinion J, to traverse the carriage and dog F, to set the log.

The pinion .I is fastened to the shaft K, which turns in stands fastened in the block A, and has the ratchet-wheel L fastened to it to turn it by the pawl M, which is hung loosely on a pin in the link N, which link is made in the form shown in the drawings, and fitted to vibrate freely on the shaft K. It is raised by the perpendicular slide I?, which traverses in the stand Q, fastened to the block A. This slide I is pushed up by the bent lever R, hung in the stand S, fastened to the under side of the block A, and there is a cleat, T, fastened to the door U, which cleat has a pin, V. in it, which stops the lower end of the bent lever R as it is carried by the block A, and causes it to push up the slide P.

There may be a hand-wheel, XV, fastened to the shaft K, to turn it by hand to adjust the carriage E, which wheel is broken away in Fig. 2 to show the other parts of the apparatus. The cleat I may have a series of holes in it or a slot for the pin V, which may be provided with a screwnut to adjust it in the slot and set it in the position desired, and there may be several pawls of different lengths hung on the same pin, so as to turn the ratchet-wheel L the fraction of a tooth and set the log uniforml y. Y

The tail-block at the opposite end of the earriage may be constructed and arranged to operate and set the other end of the log.

To use the abovedescribed apparatus the workman places the log on the carriage in a position for the saw to make the first out and dogs it as far from the saw as he can, and the saw makes acut and the carriage is run back. After the log passes the saw lever It is stopped by the pin V, and the carriage continuing to move, the end of the lever pushes up the slide P, which moves the pawl M, turning the ratchet L, shaft K, and pinion J, which acts on the rack I, and moves the carriage E and dog F, with the log, a proper distance for a new cut, and Vthis is repeated whenever the carriage is run back, until the log is sawed.

I believe I have described and represented my improved self-setting head-block for sawmills, so as to enable any person skilled in the art to make and use it.

I will now state what I desire to secure by Letters Patent, to wit:

The combination and arrangement of dog F, carriage E, with rack I, pinion J, shaft K, ratchet L, pawl M, link N, slide P, bent lever R, and stoppin V, the whole being constructed to operate as described, for the purpose set forth.

NEIIMI AH KIMBALL.

Witnesses:

THOMAS C. GREENE, LUoiEN MEssrNeEE. 

